It looks like the consensus response is other countries embracing more multilateralism. This is a huge opportunity for proponents and governments that promote multilateralism to take charge and make it happen. Ex: China has restricted trade with Aus since 2020 because they, essentially, insulted China/didn't restrict their speech in ways that China wanted. This provides an opportunity for this to be rolled back, which is economically win-win (as most free trade is). Expect to see this sort of thing many times over between many countries in the world. Of course this is rooted in the fact that having ex-US trading partners is no significantly more valuable.
There is the second point to mention too though, which is that China is not exactly an exemplar of open markets and free trade, which is why you are not seeing many countries ally with China and form a united front against the US's trade rampage. Looking beyond the deranged policies, there are some truths in saying that China is a currency manipulator, has imbalanced trade to such a degree it causes problems in other economies, and even the somewhat more "far fetched" points about the unsustainability of a permanent trade deficit do have some truth on some level.
That is why, yes, you are seeing the EU normalize trade relations with China, but there are important caveats, like discussions about China having an expert quota and even internally capping production numbers within their own economy are on the table front and center. This would have never happened before, because China's strategy was to peg a low currency, export, and extinguish industries ex-China. Wish to some level is part of free trade, but it is underpinned in China with state sponsorship to a higher degrees in most trading partners are comfortable with (which is of course countered by the allure of cheap goods).
So another view would be that parties like the EU have new leverage against China that they can use to cut trade deals that strip out some of the abusive practices that made them uncomfortable in the past. If China is then willing to move on a bit from these approaches then the net outcome should be beneficial for the world of course.
I think that many players see the dangers of taking binary sides now more than ever. And indeed, skilled negotiators should see the advantages of playing these forces against each other to get what is best for them. In the face of the recent outrageous events, I would expect a sudden outburst of pragmatism elsewhere.